Continuity mistake: In the scene where Shirley and her daughter Milandra argue about Shirley going on holiday, Milandra gets out of bed and dresses quickly, her shirt is tucked into her jeans. She walks out and the camera angle changes to a view of her front, her shirt is now loose outside her jeans.
Continuity mistake: When Shirley is with her son in the squat in Kirby he sees a couple of kids robbing a car. When the car drives away you can clearly see that the kid driving is replaced by an adult stuntdriver.
Answer: Gas storage tanks.
J I Cohen